I have difficulties throwing away empty packets of sugar and such, that I have got from random cafés when abroad. I go like "Oh, I should keep it because it's from Germany"... I keep them as souvenirs, but for no use.

Nope my mum kept everything that ever went into her house and I hated it. She keeps all kinds of crap she will never use or need. I'm the opposite and barely hang on to anything,sometimes I throw stuff out and think " crap" wish I'd kept that but I'd rather be my end of the spectrum.